// Copyright 2019 The Vearch Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.

package fileutil

import (
	"bytes"
	"fmt"
	"os"
	"testing"
	"time"
)

func TestWrite(t *testing.T) {
	data := []byte("test string\n")
	fname := fmt.Sprintf("/tmp/atomic-file-test-%v.txt", time.Now().UnixNano())
	err := WriteFileAtomic(fname, data, 0664)
	if err != nil {
		t.Fatal(err)
	}
	rData, err := os.ReadFile(fname)
	if err != nil {
		t.Fatal(err)
	}
	if !bytes.Equal(data, rData) {
		t.Fatalf("data mismatch: %v != %v", data, rData)
	}
	if err := os.Remove(fname); err != nil {
		t.Fatal(err)
	}
}
